Question

我正在调用firstpage.php它改变$ _SESSION ['Progress']会话值。但是当我调用progress.php获取$ _SESSION ['Progress']会话值时，它会保持“1”值。 progress.php不提供更新的值。我手动检查firstpage.php工作正常。但我不知道为什么progress.php没有给出更新的价值。

var progressInterval;
  $.ajax({
          type: "POST",
          url: "firstpage.php",
          cache: false,
          data: {
            first: first
          },
          success:function(result)
          {
            if(progressInterval) {
                clearInterval(progressInterval); //if I remove this session still show "1" output
            }
            alert(result); // print session value. ex:- value- 1,2,3,4,5,6,7,8,Final=8
          }
  });

  progressInterval = setInterval(function(){
      $.ajax({
          url:'progress.php',
          type: 'get',
          data: {"name":"Progress"},
          dataType:'json',
          success: function(data) {
              $('.output').text((parseInt(data.progress))+"%"); // KEEP SHOWING 1% (why value does not change?????)
          },
          error:function(err){
              console.log(err);
          }
      });

  }, 1000);

firstpage.php

session_start();
$_SESSION['Progress'] = 0;
  $data=0;
  $progress=$_SESSION['Progress'];
  foreach($album_data as $row) //assume foreach works fine.
    {
        $progress++;
        $_SESSION['Progress'] = $progress;
        $data.=$progress.",";
        session_write_close();
    }
  }
  echo $data." final=".$_SESSION['Progress']; //output-1,2,3,4,5,6,7,8 final=8

progress.php代码

session_start();

getProgress($_GET['name']);

function getProgress($filename) {
    if (isset($_SESSION[$filename])) {
        echo json_encode(array("progress" => $_SESSION[$filename]));
    } else {
        echo json_encode(array("progress" => 0));
    }
}

Answer 1

session_write_close();结束当前会话并存储会话数据。

在循环的每次迭代中，您需要使用session_start();

重新启动会话

Answer 2

我在firstpage.php中更改了。它现在有效。

session_start();
$_SESSION['Progress'] = 0;
 $data=0;
  $progress=$_SESSION['Progress'];
  foreach($album_data as $row) //assume foreach works fine.
   {
    session_start(); //we need to start session because we closed the session using session_write_close(); 
    $progress++;
    $_SESSION['Progress'] = $progress;
    $data.=$progress.",";
    session_write_close(); // need to close because we getting the value uses at progress.php. 
   }
 }
 session_start();
 echo $data." final=".$_SESSION['Progress']; //output-1,2,3,4,5,6,7,8 final=8

Answer 3

你试试这个。你有index.php，其中$_SESSION['Progress']的获取值是index.php包含的

<强>的index.php

<html>
<head>
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
    <script>
        var progressInterval;

        progressInterval = setInterval( function(){
        $.ajax({
              url: "progress.php",
              data: { name: 1 }
            }).done(function(msg) {
               $("#test1").text(msg);
            });
        }, 2000);
    </script>
</head>
<body>
    <p id='test1' class='output'></p>
</body>
</html>

它将每2秒获取一次$_SESSION['Progress']。

这里 progress.php 包含

session_start();
getProgress($_GET['name']);
function getProgress($filename) {
    if (isset($_SESSION['Progress'])) {
        echo json_encode(array("progress" => $_SESSION['Progress']));
    } else {
        echo json_encode(array("progress" => 0));
    }
}

然后是 firstpage.php

session_start();
  $_SESSION['Progress'] = 0;
  /*
  $data=0;
  $progress=$_SESSION['Progress'];
  foreach($album_data as $row) //assume foreach works fine.
    {
        $progress++;
        $_SESSION['Progress'] = $progress;
        $data.=$progress.",";
        session_write_close();
    }
  }
  echo $data." final=".$_SESSION['Progress']; //output-1,2,3,4,5,6,7,8 final=8
  */

firstpage.php仅适用于更改$_SESSION['Progress']值。

尝试打开2个浏览器窗口。一个用于index.php，另一个用于firstpage.php。

保持index.php打开，同时将firstpage.php中的$_SESSION['Progress']值更改为2（例如）并重新加载页面firstpage.php。然后，您会发现$_SESSION['Progress']的值index.php在{"progress":2}更改为{{1}}

后按ajax请求返回

所以我认为你在执行ajax请求时遇到了问题。

Session没有在php中获得更新值

3 个答案: